下面是我的代码：

#include <stdio.h>

int validate(int low, int high);

int main ()
{
    //Declare Variables
    float strength, speed, defense, intelligence;
    float strengthRatio, speedRatio, defenseRatio, intelligenceRatio;
    int strength_F, speed_F, defense_F, intelligence_F;
    float sum;
    int luck;
    float PStrength=10;
    float PDefense=20;
    float PIntelligence=40;
    int PHP=10;
    float EStrength=30;
    float EDefense=40;
    float EIntelligence=25;
    int EHP=10;
    int sel;
    float attackp;
    float magicp;
    int low=1;
    int high=3;
    int Valid_Selection;

    //Clear Screen
    system("cls");

    //Display Logo
    printf("+----------------------+\n");
    printf("|                      |\n");
    printf("|     CODE QUEST       |\n");
    printf("|                      |\n");
    printf("+----------------------+\n\n");

    //Main Menu
    printf("--Main Menu--\n");
    printf("\n");
    printf("1 - New Game\n");
    printf("2 - Load Game\n");
    printf("3 - Exit\n");
    printf("\n");
    printf("Selection: \n\n");

    // Validate user input using a function
    Valid_Selection = validate(int low,int high);

    // Game_Selection = validate();

    printf ("Character Creation \n");
    printf ("Please enter your desired stats for your character:\n");
    printf ("\n");
    printf ("Enter strength: ");
    scanf  ("%f", &strength);
    printf ("Enter speed: ");
    scanf  ("%f", &speed);
    printf ("Enter defense: ");
    scanf  ("%f", &defense);
    printf ("Enter intelligence: ");
    scanf  ("%f", &intelligence);

    // Calculate the sum of all attributes
    sum = strength + speed + defense + intelligence;

    // Calculate ratios for each attribute
    strengthRatio = strength / sum;
    speedRatio = speed / sum;
    defenseRatio = defense / sum;
    intelligenceRatio = intelligence / sum;

    // Calculate the final Stats as whole number
    strength_F = strengthRatio * 100;
    speed_F = speedRatio * 100;
    defense_F = defenseRatio * 100;
    intelligence_F = intelligenceRatio * 100;

    // Calculate the player's luck
    luck = (int)sum % 30;

    // Create an empty line for beauty
    printf ("\n");

    // Display to the user the finalized player stats
    printf ("Your player's final stats are:");
    printf ("\n");
    printf ("Strength: %d\n", strength_F);
    printf ("Speed: %d\n", speed_F);
    printf ("Defense: %d\n", defense_F);
    printf ("Intelligence: %d\n", intelligence_F);
    printf ("Luck: %d\n", luck);

    // Display "Battle Starts"
    printf("Battle Start!\n\n");

    while (PHP >= 0 && EHP >= 0) {
        //Display user and enemy HP and asks user which attack execute
        printf("Your HP: %d, Enemy HP: %d\n", PHP, EHP);
        printf("1 - Attack Power\n");
        printf("2 - Magic Power\n");
        scanf("%d",&sel);

        //Option 1, Option 2
        if (sel == 1) {
            attackp = (PStrength / EDefense) * 5;
            EHP = EHP - attackp;
            printf("You attacked the enemy\n");
        }
        else {
            magicp = (PIntelligence / EIntelligence) * 5;
            EHP = EHP - magicp;
            printf("You bewitched the enemy!\n");
        }

        // Enemy reaction based on his own HP
        if (EHP <= 0)
            printf("You won!\n");
        else {
            attackp = (EStrength / PDefense) * 5;
            PHP = PHP - attackp;
            printf("The enemy attacked you\n");
        }

        // Indicates if user lost the game
        if (PHP <= 0)
            printf("You lost!\n");

        printf("\n");
    }

  return 0;

    }

    int validate(int low, int high) {
    int s;

    do{
    scanf("%d", s);
    if (s<1 || s>3)
        printf("invalid Input, try again:");
    } while (s<1 || s>3);

    return s;
    }

    int validate(int low, int high) {
        int selection;

        do {
        scanf("%d", selection);
        if (selection <0 || selection>3)
            printf("Invalid Input, try again: ");
        } while (0<selection<4);

        return selection;
    }

字符串
我想让用户输入一个1到3之间的数字，我需要验证功能来验证它。谁能解释一下我哪里出错了吗？什么是正确的方法？